The best replacement for 16 ohm is 8 ohm.

The best alternatives to 16 ohm are rated as following:
★★★★★  8 ohm
★★★★  32 ohm
★★  4 ohm
★  400 ohm
★  8 ohm speakers
★  8 ohm speaker

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Speaking about 16 ohm, one probably shouldn't forget about 8 ohm speaker.

Other search terms related to 16 ohm and their ratings are:
★★★★★ 8 ohm speaker
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16 ohm
8 ohm
32 ohm